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Carotenuto G.,National Research Council Italy | De Nicola S.,Istituto Nazionale di Ottica | De Nicola S.,National Institute of Nuclear Physics, Italy | Palomba M.,National Research Council Italy | And 4 more authors.
Nanotechnology | Year: 2012

The mechanical properties of GNP/LDPE nanocomposites (graphite nanoplatelets/low density polyethylene) have been investigated, in order to establish the effect of nanoscale reinforcement within the polymer matrix. Results show that the presence of the filler does not involve a change in the microscopic structure of the polymer. However, on a macroscopic scale, GNPs limit the mobility of the polymer chains, resulting in an increase in stiffness for the final composite. Orientation of GNPs within the LDPE matrix is also an important issue that affects mechanical properties and it has been evaluated by testing nanocomposites made by different manufacturing techniques (compression moulding and blown extrusion). The comparison between the experimental data and the Halpin-Tsai model shows that the orientation of GNPs due to the extrusion process leads to values of tensile modulus higher than that obtained with the randomly oriented disposition resulting from the compression moulding technique. © 2012 IOP Publishing Ltd. Source

Remondino F.,Bruno Kessler Foundation FBK | Rizzi A.,Bruno Kessler Foundation FBK | Barazzetti L.,Polytechnic of Milan | Scaioni M.,Polytechnic of Milan | And 3 more authors.
Photogrammetric Record | Year: 2011

This paper presents an overview of a number of diagnostic campaigns carried out to assess the conservation state of paintings. The specific characteristics required in cultural heritage applications have been investigated and are reported, where two main fields are considered: radiometric analyses using multispectral images and 3D surveying for geometric deformation analysis by means of photogrammetry and laser scanning. The activities described were accomplished in interdisciplinary teams, composed of photogrammetrists, art-historians, restorers and experts of non-destructive diagnostic techniques. © 2011 The Authors. The Photogrammetric Record © 2011 The Remote Sensing and Photogrammetry Society and Blackwell Publishing Ltd. Source

Piegari A.,ENEA | Sytchkova A.,ENEA | Della Patria A.,Istituto Nazionale di Ottica | Fermi F.,University of Parma | Oleari C.,University of Parma
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The design of a compact spectrometer for analysis of artworks is presented. Its operation is based on the use of a variable transmission filter associated with an array detector. The instrument allows the measurement of the spectral reflectance factor and combines the acquisition of data in a continuous spectrum with the small dimension that is of primary importance for in-situ spectral imaging. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE). Source

Gardini L.,University of Florence | Capitanio M.,University of Florence | Pavone F.S.,University of Florence | Pavone F.S.,Istituto Nazionale di Ottica
2014 Fotonica AEIT Italian Conference on Photonics Technologies, Fotonica AEIT 2014 | Year: 2014

We show a new technique that we developed for 3D tracking of single fluorescent molecules inside living cells with nanometer accuracy. To account for the optical sectioning of thick samples we built up a HILO (Highly-Inclined-and-Laminated-Optical-sheet) microscopy system [1], through which we can excite the sample in a widefield configuration by a thin sheet of light, spanning the entire thickness of the cell with a SNR much higher than traditional WF microscopy. Under these illumination conditions, we apply a method capable of reaching nanometer x, y, z localization by exploiting the properties of the point-spread-function of out-of-focus fluorescent probes. © 2014 AEIT. Source

Lapucci A.,Istituto Nazionale di Ottica | Ciofini M.,Istituto Nazionale di Ottica
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

In the framework of a national applied research project we have been designing and testing several different prototypes of ceramic slab Nd:YAG Lasers pumped by various laser diode arrays in vertical and horizontal stacks. We also investigated possible variations of the slab geometry. To reduce thermal effects, architecture with transverse (in the thinner cross-sectional dimension) or lateral (in the wider cross-sectional dimension) zig-zag propagation have been compared. Face- and edge-pumping have been tested with different diode stacks configurations. Finally the adoption of multipass-stable or hybrid stable-unstable resonators has been thoroughly investigated in CW and Pulsed operation. Compactness, efficiency and ruggedness have been the principal design drivers of our work. Nevertheless beam quality and insensitivity to diodes temperature have also been looked for. In this presentation the results of the whole research activity are summarized and explained. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source

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